Turbo blower



March 17. 1925. 1,529,925

J. SAY.

TURBO BLOWER Filed June 19 1922 2 Sheets-Sheet l ffy. 3.

March 17. 1925.

J. l SAY TURBO BLOWER Filed June 19 1922 2 Sheets-Sheet 2 Patented Mar. 17, 1925.

ulsuriiol STATES .AMES SAY, OF MANCHESTER, ENGLAND.

TURBO BLOWER.

Application @led June 19, 1922. Serial No. 569,314.

l To all whom t may concem:

Be it known that I, JAMES SAY, a subject of the King of Great Britain and Ireland, residing at Manchester, in the county of Lancaster, England,have invented Improvements in or Relating to Turbo Blowers, of which the following is a specification.

This invention relates to that type of turbo-blower in which two sets of multistage impellers and stators are mounted in (zo-axially arranged truncated conical air compressing chambers provided at their opposite smaller ends with air inlet openings and having their larger ends facingone` another and communicating with a delivery chamber or chambers having a compressed air outlet or outlets between them, the two sets of impellers bein'g fixed upon a shaft common to them and extending co-axially through the two chambers. A turbo-blower of this type is described in the speci- 'ication of British Letters Patent No. 3740 of 1911, granted to me, the two truncated conical chambers with an intermediate compressed air delivery chamber common to I them, being, lin the example described and shown in such specification, constituted as a single structureor casing that is divided horizontally in such a manner as to admit of the upper part being readily removed from the lower part and from separate air inlet covers or heads fixed to the lower part, in order to admit of the stators and impellers being easily assembled, and of ready.

access being gained to the interior of the casing for inspection thereof when this may becomes necessary or desirable.

Now the present invention has for its object to improve the construction and working of turbo-blowers' of the kind referred For this purpose, according thereto-thc stators are constituted by rings of blades of gradually increasing diameter externally, towards the compressed air delivery chamber, and the impellers are constituted by metal discs, also of gradually increasing diameter towards the delivery chamber, and having central solid portions fixed to the impeller shaft and outer rings of vblades that are arranged to rotate between and opposite therings of stator blades. r1`he central solid portions of the successive impellers in` eachset thereof may be held firmly one against the other and tothe impeller shaft, as by nuts screwed on the impeller shaft, to forma solid central core extending through the corresponding set of stator rings so that air that is being compressed is constrained to flow through the'rings of impeller and stator blades to the delivery chamber and outlet and cannotreturn through the central portions of the chambers to the inlet ends thereof. The im.- peller shaft may be held in position endways relatively tothe casing, by. adjustable nuts on the shaft bearing iagainst the outer sides of the end covers or heads of the casing, (so that the rings of impeller blades can readily be adj-usted endways in relation to the rings ofstator `blades to suit requirement., n

The vbearing located within the compressed air delivery chamber .of a single structure blower such-i as that described in the said former specication, for supporting the central `portions vof the impeller shaft, may advantageously have its opposite end portie s provided with outer pe-` ripheral rings of blades to form additional stators opposite which the innermost rings of impeller blades rotate. f

In the accompanying illustrative drawings, vFigs 1, 2 and 3 show respectively in side elevation, end elevation and longitudinal section, a turbo-blower embodying the present invention, the impellers being shown in vertical section in the left hand portion of Fig. v3 and in elevation in the right hand portion of the said figure- Figs. 4 and 5 show one ofthe stator rings in end and side View respectively. Figs. 6 and 7 show one ofthe impellers in end and side view respectively. n Fig. 8 shows in end view, a central stationary bearing for the im-peller shaft adapted to form 'additional stator.

' In the example shown, a and a1 are the two truncated portions of the casing arranged with their larger ends adjacent to each other and adapted to form between them an air delivery chamber b provided with. a compressedv air delivery outlet b1 and c and d arethe end covers detachably secured to the' smaller ends of the, casing by bolts e and each provided lwith air inlet apertures g is the impeller `shaft mounted at its outer end portions antifriction bearings la in the 'end covers c and :i and held in place longitudinally by nntsz' screwed on the shaft and bearing, through interposed cover plates j, against the outer sides of the end covers c and al. The casing a f1.1 is divided horizontally at the line .r a: in the plane of the axis of the propeller shalt, the upper and lower parts thus formed being secured together by bolts Zo so that the upper part can, as heretofore, be removed from the lower part and from the end covers c and d when desired. `Within a series of annularparallel grooves m in each of the two conical end portionsn a al of the casing'are firmly held, as in my former construction of turbo-blower, a series of stators. .Each of these stators, however,

according to the present invention, vis x ecn-- stituted,as shown more clearly in Figs. e and 5, byv a ring of blades 'n carried by outer and inner rings nl and n? respectively, the outer ring nl heing located in its corresponding groove m in the casingwhen the upper and lower parts thereof are `fixed together.

The impellers for (3o-acting with the stators,

each consist as shown more clearly in Figs. 6 and 'Lof a. solid central portion o provided at its outer periphery with a ring of im-l vpeller yblades p of an axial thickness to' lit between the annularustators with suitable clearance between them, the central solid portion of the im eller being of greater' thickness than the ring v`of blades 7), asshown at o1, (Fig. 7 ),so as to extend through the adjacent .stator fring n vn1-"11? 'and bear against the solid v portion ofthe next adjacent impeller. The-successive impellers in each set thereof, are held firmly one against the other and upon the impeller shaft g by nuts 4' screwed on the shaft. For this purpose, the portion of the shaft upon which the impellers are mounted, may, as shown, be made of taper shape, or the central portion gli ofl theimpeller shaft maybe made of greater diameter than the remaining portions so as v'to form annular shoulders against which the impellers can be v-forced, andsecured in place by the nuts r. The successive rings of stator blades n and impeller .blades p are, as shown,

made of gradually decreasingv radius and with the blades therein olf-gradually increasing pitch, so that the air entering the two opposite' outer ends volif-the casing or, 0,1-

- through the apertures f will beconstrained to pass through the ringspof blades, and'be gradually increased in pressure as it flows towards thejcompressed air delivery cham'- ber b whence it willwliolly be compelled to vpa'ss'throu'gh the outlet bl. By making each of the air compressing chambers of trun cated conical shape as shown, the peripheral velocity of the successive impeller rings increases/cowards the outlet 'chamber as the pressure of the air increases, which is' mportant.

l the blower.

As will be'understood, as the reactionot the airpressureupon the two opposite coaxial sets of impellers is exerted in opposite directions, the two portions of the impeller shaft at opposite sides of the central portion will be' s'ubjectedto tensile stresses exerted Vin opposite direc'tionsso that whipping of the shaft will be'avoided.

The first or outer niost iinpeller ring p, in each set of impeller rings is preferably made radially wider inthe axial direction than the remainder of the. impeller rings, as shown in Fig. 3, so that it may take the maximum amount of free air necessary to lill the iirst or outermost stator ring n, nl, n2. The. 'remaining iinpeller rings may be oit the soA same width in the axial direction though of l increasing diameter. The first or outermost nnpeller in each set of impellers is'preferably thicker or stiller than the others so that 'with opposite disc-like end portions szthe outer peripheral portion of each ofwhich is fixed in a groove tin the corresponding truncated conical portion aor 041 of the casing and is provided with a ring of blades. u to form a stator opposite which the innermost i ringof impeller blades p rotates. The bearingl s may, as shown, be centrally recessed to contain the races and antifriction rollers- -or balls of an antifriction bearing arrangement o that directly supports the said central portion of the shaft and is held in place endways by a ring o1- screwed into the boss of the vstationary bearing s.

" Each of the rings of stator blades and'of l the impeller blades may be cast in fone piece with the partscarrying'them. Each statorl ring may however be made in 1n halves, as maybe desired. v

vThe caslng a1 and the end covers 0r one piece or heads' c and d may, as -shown, be-made hollow to permit of the circulation therethrough of a cooling fluid, for instance wa-l ter, to keep them cool and also to ,enabler cool v compressed The blower casing'a a1 with'end covers c and a? may, as shown, be'lixed," as by 4bplts'w,

to a bed plate y adapted tocarry a motor, V

forinstance an electric motor, or 'a steam air vto beJ delivered from turbine, for rotating the impeuer shaft' aanv l impellers,

The upper part ofthe a allmaybe of said delivery provided-with'hooks l and' jointed links2 to facilitate its. being` lifted from the lower part of' the casing.

What -I claim is :-v v 1. A' turbo-blower of the kind herein referred to, comprising a stationaryfcasing having inlets for fluid at its opposite ends and a central delivery chamber for compressed tluid, a driving shaft extending centrally through said casing and carried by bearings in the end walls of said casing, two co-acting sets of rings of stator and impeller blades of gradually increasing ,diameter and decreasing radial width arranged withinsaid casing at opposite sides chamber so that the passages for fluid from tha-inlets to the de-V livery .chamber are of decreasing cross sec- '.tional area, and two sets of rotary discs fixed to said shaft, at opposite sides ot said delivery chamber and carrying said rings ot impeller blades, each set of said discs extending through the corresponding set of rings of stator blades and bearing one against the otheri Y 2. A turbo-blower of the kind herein re'- ferred to, comprising a stationary casing having inlets for fluid at its opposite ends and a central delivery chamberA for compressed tluid, two sets of rings of stator blades fixed within said casing andarranged at opposite sides of said chamber, said rings of stator blades being of increasing diameter toward said chamber 'but of decreasing ra dial width, a vdriving shaft extending through said casing and co-axial with said rings of lst tor blades, two sets of rings of impeller. blades also arranged at opposite sides of said chamber and of gradually increasing diameter towards said chamber but ot decreasing radial width, arranged'to revolve past the stator blades, the rings of stator blades and impeller Yblades in each set beingalternately arranged and near'together throughout the set, and discs carrying the sets of impeller blades, tixed to said shaft, extending through the rings of the stator blades 'and bearing directly ,one

against the other. Y

3. A turbo-blower of the kind herein referred to, comprising a. stationary casing shaped internally to form oppositely arranged truncated lconical chambers having their Ysmaller" endslremote from each other and provided 4with inlets for fluid and their .larger ends facing one another and a compressed tluid delivery chamberv between the larger ends of said conical chambers, two setsof stators secured in said conical chamber at opposite sides of saiddelivery chainber, each setbeing constituted by rings or f blades of increasing diameter but-of decreasing radial wi'dth towards said delivey'chamber, na riving shaft extending through and coa a1 with said conical chamv ber and two sets of impellers fixed to said shaft `at opposite sides"v of said' delivery chamber', each Jfa set of solid discs ot'increasing diameter towards said. delivery lchamber and periphf eral '-rin'gs'br blades carried by saidl discs,

` the rings of impeller blades being 'arranged' a solid core extending through the corresponding set of rings of statorv blades.4

4..Aturboblower of the kind herein refer-red t'o, comprising a Y stationary casing with air inlets at its opposite ends and a central compressed air delivery chamber, rings of stator bladesuqof increasing diameter and decreasing radial width fixed within said said delivery chamber,A ringsf'rof impeller blades, also of increasing diameter and decreasing radial width, arranged at opposite sides of said delivery chamber, adriving shaft coaxial with said'rings'of stator and impeller blades, two sets of impeller discs carry-'ing the impeller blades and means within said casing for holding the discs in each set firmly on said shaft and one against the other to form a,s'olid core extending tlnough the corresponding rings of stator blades. thediscs in each setbeing of gradually increasing diameter vtowards the deiset .of iinpeller's comprising casing Yat opposite sides ofl 'loo 'livery chamber. so thatfthe passage way through the rings of stator .and 'impeller biades and between the casing and impeller discs is of decreasing cross sectional area tof wards 'the said delivery chamber, substantially as described for the purpose set Jforth. 5. turbo-blower of the hind herein referred to, comprising a stationary casing Yhaving end covers a central compressed air delivery chamber, two sets of multi-stage impellers and stators arranged within said casing at opposite of said delivery chamberbearings carried byv said end covers, a shaft extending through said casing and bearings and carryl 'ing saidmpellers and nuts adjustable on said shaft and bearing side of Ysaid end covers and impellers can hel adjusted endways relatively to said stators. A

6. A turbo-blower of the kind herein reerred to, comprising a stationaryV easing having end covers with"inlets `for fluids and a central compressed air Vdelivery chamber, two sets of multi-stage impellers andstators arranged within said casing at opposite sides ofsaid delivery chamber, bearings carried by said end covers, a shaft extending throu h Ysaid casing and bearingsY and carrying e 'nnpellers,A and a stationary fixed in inst the outer` whereby the shaft sides y ausl "of blades to form additional stators opposite the' innermost rings of impellers, substan- 'tially as described.

7, A turbo-brewer @mpi-aging adivided casing shaped internally to form two op` positely yarranged truncated conical chainbers and between such chambers a deiivery chamber having an outlet for compressed Huid, end covers securedto the casing and provided with inlets for Huid, an endways adjustable driving shaft extending through said casing and end covers and mounted in bearings carried-b said end covers, a bearing located in said delivery .chamber and ber, a series of annular sets of ixnpellerV blades arranged to rotate opposite the stator blades, the rings of stator and -impeller blades being arranged alternately and near together throughout the` series and solid rings or discs fixed to the driving shaft and carrying the impeller blades, sald rings or discs extending through the rings'of stator and impeller blades and vbearing directly against one another substantially as described.

Signed at Manchester, England,- this' second day of J une 1922.

JAMES ser. 

